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Chemical Addition:

Chemicals utilized for adjustment of parameters interact so one should NEVER add more than one chemical at a time.  As an example, if the pool pH is high and the chlorine level is low the correct approach is to add acid to adjust the pH, wait 24 hours and add again if necessary (make small changes until you get a "feel" for response).  Once the pH is within the desired range, adjust the chlorine, wait 24 hours, repeat test and adjust again if necessary.  If you attempt to add acid to lower the pH and, at the same time, increase chlorine to raise its concentration, you may depress the pH more than necessary.  Addition of chlorine can lower apparent pH.